Dynamo-electric machine and winding therefor



Sept. 6, 1927. 1,641,644

W. H. POWELL DYNAMOELECTRIC MACHINE AND WINDING THEREFOR Original Filed May 16, 1924 2 Sheets-Sheet l Q) vvue/vx'Y/ov l%& I

A I monkeys Sept. 6, 1927. 41,644

W. H. POWELL DYNAMO-ELECTRIC MACHINE AND WINDING THEREFOR Original Filed May 16, 1924 2 Sheets-Sheet 2 Patented Sept. 6, 1927-.

WILLIAM E. POWELL, OF WAUWATOSA, WISCONSIN, ASSIGNOR TO ALLIS-CHALMERS IANUI'ACTUBING WISCONSIN.

GOKPANY, or umwauxnn, W sconsin, a conronarron or nnwmo-mc'rnrc moms in wnmnwa THEREFOR.

Original application am my 16, 1924,

This invention relates to dynamo-electric machines and windings therefor.

The objects of the invention are the same as those set forth in applicants copiending application Serial No. 713,723, filed ay 16,

1924 and of which latter the present application is a division. 1

It is at timesdesirable or necessary to use a slotted armature for dynamo-electric machines in which the number of slots per pole as well as the slots per pair of poles is an integer. The present a plication relates.

' to that embodiment of the mvention broadly claimed in the hereinbefore mentioned co- 1 pending application, in which embodiment the herein efore mentioned condition obtains.

The novel features will appear from this specification and accompanymg drawings forming a part thereof and disclosing one embodiment of the invention and all of the novel features are intended to be pointed out in the claims. Y

In the drawings: Fig. 1 is a diagrammatic showing of a dynamo-electric machine illustrating one embodiment of the invention.

, Fig. 2 is a diagrammatic showing of a dynamo-electric machine illustrating a modification of the invention. j

Referring to Fig. 1, the machine here illustrated is provided with eight poles A, B,

C, D, E, F, G, H. The armature is of the slotted type, the number of slots bein 32 35 and the commutator segments or bars 0 the same number. Each slot is shown as containing four conductors and as each conductor represents one side of a coil or wmdmg element, there is a total of 64 coils all connected to the same commutator. Of the 64 coils, 32 coils are wound in the form of a simplex lap winding and the remaining 32 coils are wound in the form of a wave wmd- 7 ing. The wave winding here shown is of the simplex type inasmuch as all of the conductors are included in tracing from given startin point back to the same starting point, ut it is quadruply re-entrant and cation relates to that mm no. name. :mmm and um application filed March 15, ms. amuse. 94pm. 1

therefor has eight circuits, which is the same as the number of circuits in the lap windmg. It IS Of course to be understood that the nvention is not at all restricted to any specific number of poles, slots, coils and commutator bars except that the present appliarticular condition 1n whlch the number of slots-per pole is an integer.

Considering the windin of Fig. 1 more specifically, it will be note that a given lap coil, as for example coil 45, has one of its c011 s des46 in slot a. In considering the position of the conductors or coil sides in a slot the radially outermost conductor may be designated as disposed in position No. 1, the next conductor, count' radially inwards, as No. 2 and so on. Coil side 46 is thus in posltlon No. 2. The other coil side 47 of c011 45 is in positionNo. 3 in a slot 12 which, in the present instance, is four slots from slot (1. As there are 32 slots and 8 poles and therefore 4 slots per pole, the windin is a full pitch windin The back con uctor itch of both the lap and wave coils is 9.

he front conductor pitch of the wave coil is 5 and of the lap coils 7. All of the lap coils are ositioned in the slots similarly to coil 45','t at is, they are-in positions Nos. 2 and 3. This is however not essential; the lap coils could, for example, occupy positions Nos. 1 and 4. It is moreover not essential that the winding be a full pitch one, as illustrated in Fig. 2.

Considering a coil 48 of the wave winding,

this has a coil side 49 disposed in position No. 1 of slot 11, and another coil side 50 disposed in position No. 4 of slot 6. The slot pitch of this coil is therefore also 4 in this instance. Lap coil 45 and wave coil 48 thus account for positions Nos. 1 and 2 in slot a and positions Nos. 3 and 4 in slot b. It is therefore clear that these coils may be taped up together andthe unit thus formed may be laid in the slots in the same manner as is the practice with an ordinary lap coil. It will be noted that the front end-connectors of lap coil 45 run toward each other and are conected to commytator bars 1 and 2. The front end-connectors of wave coil 48 diverge relatively and are connected to commutator bars 30 and 5. It is therefore clear that with the consideration of lap coil 45 and wave coil 48 all of the coils in the winding are accounted for because all of the other similar pairs of lap and wave coils are similarl located in the successive slots.

he lap coils are balanced against the wave coils group by grou For example the four consecutive lap coils 45, 55, 56 and 57 are balanced against wave coils 52, 58, 59 and 60. That is, the said four la coils are disposed to generate the same E. F. as the said four wave coils, and the four lap coils are influenced by two adjacent poles whereas the four wave coils are influenced by all of the poles. Moreover, each commutator bar is connected to every other bar 360 electrical degrees from it which should operate at the same potential, through a lap coil and a wave coil generatin substant1a1l equal and opposite E. M. .s. Also eac bar has connected thereto two pairs of coils, the respective coils of each pair bem d18- posed to generate substantiall equal M. F.s. For example, bar 5 as connected thereto the pair of coils 48, 53 and the pair of coils 57 and 60. The foregoing is all explained in greater detail in applicants hereinbefore metioned copendlng application.

It will be noted that the slot pitch and the back conductor pitch of the lap and wave coils is e ual.

Referring to ig. 2, this shows a machine having the same actors as the machlne of Fig. 1 except that the slot pitch of the lap and wave coils is 3. As in Fi 1, the lap winding is indicated by the lig t lines and the wave winding by the heavy lines. The back conductor itch of both lap and wave coils is 7. The ront conductor pitch of the wave coils is also 7 but the front conductor pitch of the lap coils is 5. The avera e of the front and back .conductor pitches o the wave winding in Fig. 2 is the same as the average in Fig. 1 and this average in both cases is e ual to the diflerence between the number 0 conductors in the wave winding and the number of circuits in the lap winding divided by the number of poles so that the wave winding will have the same number of circuits as the lap winding.

It is to be understood that the present invention is also applicable to multiplex windings, where, for example, the lap winding component of the winding comprises three independent lap windings termed a triplex winding, as disclosed in applicants hereinbefore mentioned. copending application, or any case in which it is permissible to make the number of slots per ole an integer.

It should be understoo that it is not desired 'to limit the invention'claimed to the exact details of construction'shown and described, for obvious modifications may occur to persons skilled in the art.

It is claimed and desired 'to secure by Letters Patent:

1. In a commutator ty e multipolar dynamo-electric machine aving a slotted armature the number of slots per pole being an integer, means for equalizing the currents in the armature winding including a lap vtype winding and a wave type windln both connected to said commutator, the coi of both of said windings being of equal slot pitch and each commutator se ent having connected thereto two pairs 0 coils, the respective coils of each pair beingldisposed to generate substantially equal E. F. s.

2. A multipolar dynamo-electric machine having a slotted armature of the commutator type the number of slots er pole being an integer, a winding for sai armature including a lap type winding and a wave type winding, a group of consecutive la coils of predetermined number, a group 0 consecutive wave coils of the same number, the terminals of said groups being connected to the same commutator segments, said group of wave-coils being positioned with respect to the pairs of oles so that itis influenced by all of the pairs, the coils of both of said windings being of e ual slot itch.

3. A multipolar ynamo-e ectric machine having an armature, a windin for said armature including simplex wave win ing, said wave winding being multiply reentrant and having an average front and back conductor pitch e ual to the difference between the number 0 conductors in said wave winding and the number of circuits in said lap windin divided by the number of poles, the coi s of a lap'win mg and a the lap and wave windings having their back conductor pitches equal.

4. In a commutator type dynamo-electric machine having a slotted armature the number of. slots per ole being an integer, means for equalizin t e currents in the armature winding inc udin a lap winding and a wave winding bot connected to said commutator, the coils of both of said windings having a slot pitch equal to the number of slots per pole.

5. In a commutator t pe dynamo-electric machine having a slotte armature the number of slots per pole being an integer, an armature windingincluding a lap winding and a wave winding connected to said commutator, a group of consecutive la coils of predetermined-number, a group 0 consecutive wave coils of the same number, the terminals of said groups being connected to the same commutator segments the coils of both of said windings having a slot pitch equal to the number of slots per pole.

6. 'In a commutator type dynamo-electric coils, the terminals of said groups being connected to the same commutator segments,

g the coils of both of said windings having a slot pitch equal to the pole.

In testimon whereof, the signature of the inventor is a Xed hereto.

WILLIAM H. POWELL.

number of slots per CERTIFICATE OF CORRECTION.

Patent No. 1,641, 644.

' Granted September 6 1927, to

WILLIAM H. POWELL.

It is hereby certified that the State of Incorporation of the assignee in the i above numbered patent was should have been given as this office; and that the therein that the erroneously given as "Wisconsin" whereas said State "Delaware" as shown by the records of assignments in said Letters Patent shouldbe read with this correction same may conform to the record of the case in the Patent Office.

Signed and sealed this 11th day of October, A. D. 1927.

Seal.

M. J. Moore, Acting Commissioner of Patents. 

